Subsurface well safety valve with light weight components
This paper describes a subsurface well safety valve for controlling the fluid flow through a well conduit. It comprises: a housing having an axial bore therethrough, valve seat positioned in the housing, a valve closure member movable between open and closed positions relative to the valve seat, a flow tube telescopically movable in the housing for controlling the movement of the valve closure member. The flow tube being made of a material having a density lesser than that of the housing, biasing means in the housing acting on the flow tube for moving the valve to a closed position, hydraulic piston and cylinder means in the housing actuating the flow tube, and the flow tube being of a material having a density of substantially less than 0.3 pounds/cubic inch for requiring less force from the biasing means to close the valve.
- Assignee:
- Camco International Inc., Houston, TX (USA)
- Patent Number(s):
- US 4977957; A
- Application Number:
- PPN: US 7-415677
- OSTI ID:
- 5212882
- Country of Publication:
- United States
- Language:
- English
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